Third normal form.
I am supposing that key means primary key.Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you get a subset what is called primary key.
database simple attritbute
a default value
DBMS acronym for Database management system. There are number of DBMS like RDBMS, ORDBMS, HRDBMS etc . RDBMS is basically to define relationship between the tales and also it follows various codds rules.
Dependency means that the one entity dependents on another entity. This is also applicable for the Function also. For Example : If you trying to check the general function which tells you about the rooms availability, which consist of checkFreeRooms() and we can have the checkForACRooms() and CheckForSuits(), So the general function for checking Rooms dependents on the other rooms as above
the number of tuple in a relation is called the cordinality of a relation?
difference between relation sehema and relation instance in dbms
Boyce -Codd normal form which is one of the forms of dbms noramlizations.normalization is converting the relations or tables in a standard form.bcnf is based on functional dependencies that take into account all candidate keys.a relation is in bcnf if every determinant has a candidate key..:)
d_id,d_name
Minimal Data RedundancyConsistency of DataIntegration of DataSharing of DataData independenceEase of Application Development
total 6 normal forms
A software system that facilitates the creation and maintenance and use of an electronic database
It is the number of attribute of its relation schema. Its is an association among two or more entities..
In DBMS, a relation instance refers to a particular set of data rows within a database table at a given point in time. It represents the actual values stored in the database for that specific table. Each row in a relation instance corresponds to a record or tuple within the table, containing values for each attribute.
I am supposing that key means primary key.Superkey is any subset of attributes that uniquely identifies the tuples of a relation. This subset need not be minimal, that is, one can remove some attributes from it and it is still uniquely identifying. If all redundant attributes are removed you get a subset what is called primary key.
It may not make sense to use a database management system (DBMS) if your data storage needs are minimal, you have limited resources, or if you require a simple and lightweight solution. In these cases, using flat files or spreadsheets could be more practical and cost-effective than implementing a full-fledged DBMS.
For small-scale projects with minimal data storage requirements, using a DBMS may introduce unnecessary complexity and overhead. In scenarios with strict real-time constraints or extreme performance requirements, the additional processing time involved in interacting with a DBMS may not be acceptable. When the data is highly unstructured or varies significantly in format, a DBMS may not be the most efficient or effective storage solution.